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Y Mmmm NJETEiS, PHOTO-UTHOSRAPHER, WASHINGTON, Dv C.

@'uithtsts ste-nt @Affinia S. S. LAVEY, 0F PLYMOUTH, INDIANA.

l Letters Patent No. 68,998, dated September 17, 1867.

IMPROVEMENT IN GHUGKS FOR WATGHMAKERS L'ATEES. i

TO ALL WHOM IT MAY GONCERN z Be it known that I, S. S. LAVEY, ofPlymouth, in the county of Marshalhan'd in the State of Indiana, haveinvented certain new and useful improvementsin Lathes; and do herebydeclare that the following isla full, clear, and exact descriptionthereof, reference being had to the accompanying drawings and totheletters of reference marked thereon.

In the annexed drawings making part of this specification, A representso. lathe for watchmakers purposes, i

which is constructed in its general features similar to those in generaluse for "such and otherpurposes. B

represents the shaft or mandrel of this lathe, which is regulated asusual by a. screw, B', at one cud. Upon Athe other end of this shaft issecured an annular metalli-c cup, C. D represents a similar cup, andofsame ,i size. These two cups are secured togetheigwith their rimstting against each other, as seen, thus `forming a` hollow head. The twocups are connected together by the screws d Z. e represents an annularplate-spring,

which has its centre punched or pressed to'one side, as seen, andwhichis placed in the hollow head, with punched centre resting'in a smallrecess in the centre ofthe cup G. K K represent `set-,screws which `passthrough the back of cup C, and press against the spring @when desirable.l The -face of cup D-isprovidediat its centre with an opening, throughwhich passes a-short shaft, G, said opening being Iliade `nearly asgreat again as the diameter of the shaft G. To the inner end of theshaft G is secured a disk, F, which is less in diameterthan the diameterof the opening or hollow of the head. The spring e presses the diskFagainst` the cup D, but not so hard that it cannot readily be adjusted.Upon the' outerend of the shaft G is aehuck, Irl, being simply anannular metallic cup with its rim outwards. Set-screws I I pass throughther chuck for stationing work within it. In Athe rim of this chuckarecut cross-dove-tailed grooves. JJrpresenttwo metallic slides, which haveone edge square Vor plain, and the other or outer edge dove-tailed orbevelled. lhesev slides have half holes formed in their plain edges, sothat when the two are placed together,l asseen in fig, 2, ;a l series ofholes, z, is formed. The slides Vlie across 'the chuck, and-the two,when placed together, t tightly" in the dove-tailed grooves in the rimof said chuckl Wheels tobe turned or worked upon `in the lathefhavetheir axis caught, as seen, in one Yof the holes inthe plates, and arethere securely retained. The slides J J` are tapering in shape, so thatthe further they are pushed up in the' grooves in the chuck the tighterthey are secured, the slides'acting asjaws to hold the work.

When work has been placed and secured in the chuck the proper centre-isascertained by moving thedisk F.- As soon as this has been done, theset-screws KVK are tightened, and the spring e pressed so iirnilyagainst `1 the disk F as td secure it iu the desired position. Thislathe can be use'd by jewellers forza. variety of work,

and with great advantage.

Having thus fully described my invention, whatI claim .as new, anddesire to secure by Letters Patent, isi The combination ofthemovableehuck H, with its slides J J, disk F, and hollow head, composedofcups C and D, and spring e, constructed and used as herein set forth.

In testimony that I claim the foregoing I have hereunto set my hand this27th day of July, 1867."

' s..s.` LAVEY.

Witnesses:

Geo. H. Barcos, LomN GAPRON.

